1. The Trinity Is One God Not Three Gods
2. Whether Father, Son, and Holy Spirit May Be Substantially Predicated of the Divinity
3. How Substances Can Be Good In Virtue Of Their Existence without Being Absolute Goods
4. On the Catholic Faith
5. A Treatise against Eutyches and Nestorius

The cover image (from Wikipedia) is an initial letter from an illuminated manuscript, and shows Boethius teaching while wearing a Santa hat.